socketapi 中recv（）函数的返回值=-1

Private newsocket, cen
Private Function addbug(obj As Long, info As Variant) As Long
Select Case obj
       Case 1
       objec = "WSAStartup"
       Case 2
       objec = "censocket"
       Case 3
       objec = "sevsocket"
       Case 4
       objec = "bind"
       Case 5
       objec = "listen"
       Case 6
       objec = "connect"
       Case 7
       objec = "accept"
       Case 8
       objec = "send"
       Case 9
       objec = "recv"
       Case 10
       objec = "WSAGetLastError"
       Case 11
       objec = "ioctlsocket"
End Select
a = debug1.Text
debug1.Text = a & objec & "=" & info & Chr(13) + Chr(10)
End Function

Private Sub Command1_Click()
Dim msg As String
msg = Text1.Text
errin = send(cen, msg, Len(msg), 0)
Call addbug(8, errin)
Call addbug(10, WSAGetLastError)
End Sub

Private Sub Command2_Click()
closesocket (cen)
closesocket (sev)
closesocket (newsocket)
WSACleanup
End Sub

Private Sub Command3_Click()
Dim msg As String
errin = recv(newsocket, msg, 1, 0)
Call addbug(9, errin)
Call addbug(10, WSAGetLastError)
Text2.Text = msg
End Sub

Private Sub Command4_Click()
Call Form_Load
End Sub

Private Sub Form_Load()
Dim sevid As sockaddr
Dim cenid As sockaddr
cenid.sin_port = htons(5106)
cenid.sin_family = AF_INET
cenid.sin_addr = inet_addr("127.0.0.1")
sevid.sin_family = AF_INET
sevid.sin_port = htons(5106)
sevid.sin_addr = "0"
Dim udttype As WSADataType
errin = WSAStartup(&H202, udttype)
Call addbug(1, errin)
Call addbug(10, WSAGetLastError)
cen = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
Call addbug(2, cen)
Call addbug(10, WSAGetLastError)
sev = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)
Call addbug(3, sev)
Call addbug(10, WSAGetLastError)
errin = ioctlsocket(sev, FIONBIO, 1)
Call addbug(11, errin)
Call addbug(10, WSAGetLastError)
errin = bind(sev, sevid, Len(sevid))
Call addbug(4, errin)
Call addbug(10, WSAGetLastError)
errin = listen(sev, 1)
Call addbug(5, errin)
Call addbug(10, WSAGetLastError)
errin = connect(cen, cenid, Len(cenid))
Call addbug(6, errin)
Call addbug(10, WSAGetLastError)
newsocket = accept(sev, sevid, Len(sevid))
Call addbug(7, newsocket)
Call addbug(10, WSAGetLastError)
End Sub

Private Sub Form_Unload(Cancel As Integer)
closesocket (cen)
closesocket (sev)
closesocket (newsocket)
WSACleanup
End Sub

Private Sub Timer1_Timer()
Call Command3_Click
End Sub


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